I got an ExpoDisc with my B&H gift card and the early opinion is WOW. This thing makes getting proper white balance a breeze. I can see that it will not be perfect for all situations, but it definitely removes color casts. I think we are so used to seeing things with a slightly warm cast that when something is truly neutral it looks "cool". Here are some sample pics... before on top of after... last one shoes a slight bonus,... this thing makes a great sensor dust map. Because the Expodisc captures a frame of uniform color, you can see every sensor booger and piece of dust, which reminds me... my camera is filthy (see the last frame)...
The usage procedure is simple... take a photo facing your dominant light source with the Expodisc on the front of your lens. Then pick custom white balance from the menu and set the camera to custom white balance and you are done. Simple as that. If you are interested in ordering, visit B&H Photo and search for ExpoDisc. It is available in numerous sizes; I ordered the 77mm one. Order the size that matches your largest filter size; you can hold it over the front of smaller lenses with no problem. It is well constructed and comes with instructional CD and lanyard so you can keep it around your neck.
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The usage procedure is simple... take a photo facing your dominant light source with the Expodisc on the front of your lens. Then pick custom white balance from the menu and set the camera to custom white balance and you are done. Simple as that. If you are interested in ordering, visit B&H Photo and search for ExpoDisc. It is available in numerous sizes; I ordered the 77mm one. Order the size that matches your largest filter size; you can hold it over the front of smaller lenses with no problem. It is well constructed and comes with instructional CD and lanyard so you can keep it around your neck.
[This attachment has been purged. Older attachments are purged from time to time to conserve disk space. Please feel free to repost your image.]
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